Grinding-wheel attachment for sewing-machines.



J. N. MOORE. GRINDING WHEEL ATTACHMENT FOR SEWING MACHINES. APPLIOATION FILED DBO.19,1907.

933,332. Patented Sept. 7 1909.

Hill

Snoeul'oz JOHN N.- MOORE, OF WASHINGTON, DISTRICT OF COLUMBIA.

GRINDING-WHEEL ATTACHMENT FOR, SEWING-MACHINES.

Specification of Letters Patent.

Patented Sept. a, race.

Application filed December 19, 1907. Serial No. 407,245.

To all whom it may concern:

Be it known that I, JOHN N. MooRn, a citizen of the United States,residing atWashington, in the District of Columbia, have invented certain new and useful'Improvements in Grinding-Wheel Attachments for Sewing- Machines; and I do hereby declare the fol lowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a new and useful sewing machine attachment.

The object of my invention is to provide an ordinary sewing machine with a grinding and abrading wheel adapted to be placed upon the bobbin shaft of an ordinary sewing machine.

In the accompanyin drawings in Figure 1 I .have shown a bobin holder device detached from the sewing machine and provided with one of my sewing machine grindin attachments. Fig. 2 shows a detached en arged view partly in section illustrating a modification of the invention.

The object of myinvention is to provide a neat and simple device adapted to be readily and instantly secured to the bobbin shaft of an ordinary sewing machine.

In every household it is occasionally desirable to polish, abrade or grind some household article, and in order to provide a ready and easily adjusted means for this pur ose I provide an ordinary bobbin shaft A aving the usual grooved pulley B adapted to be brou -ht into frictional engagement with the driving belt of the sewing machine.

In the drawin the bObbIIl holder C is shown as provide with the bobbin shaft A having the. grooved strap ulley B. Cast integral with and exten ing from this grooved pulley B is an exteriorly threaded collar 1. Upon this collar leis threaded amandrel 3 havin a threaded socket portion-2 engaging upon the collar 1 as shown. At its forward end this mandrel is provided with a shoulder 4 formed by means of the reduced threaded extending stem 5 which is adapted to removably receive a nut 7. Held between this shoulder and the nut 7 is an ordinary grinding or abrading Wheel 6.

When bringing the wheel B into engagement with the drive belt of the sewing machine sufficient power may be imparted to the grinding wheel 6 so that the same may be used in sharpening and polishing needles and knives and other articles. A polishing or bufling wheel may be substituted for the abrading wheel 6. The mandrel 3 is of metal and acts as a-fly wheel to impart steadiness of movement to the pulley B while the abrading or grinding wheel is. being used.

In Fi 2 I have shown the mandrel 13 provide with a grooved pulley 14 cast directly upon the mandrel and forming an integral part thereof. This pulley 1s interiorly t readed as is shown at 15 to receive the threaded collar 1 of the shaft A. The grinding wheel 6 is secured to this mandrel 13 by means of the nut 7. The advantage embraced in the modification resides in the fact that the ulley 14 is of a lar er diameter than the pulley 3 so that a di erent speed may be imparted to the grinding Wheel 6.

The device is simple of construction and readily operated and Havin thus described my saidinvention what I c aim is In an attachment for bobbin shafts, a mandrel having a belt pulle at one endiand with a threaded socket wlthin the pulley adapted to engage a threaded terminal of a bobbin shaft, and meansfor detachably connecting an abrading element from said mandrel at the other end.

In testimony whereof, I aflix my signature, in presence of two witnesses.

JOHN N. MOORE.

Witnesses:

M. T. Mmnnn, Gno. H. CHANDLEE. 

